Common Separate
-dumpbase <file> Set the file basename to be used for dumps
-fPIC
-Common Report Var(flag_pic,2)
-
-fPIE
-Common Report Var(flag_pie,2)
-
+; The version of the C++ ABI in use. The following values are allowed:
+;
+; 0: The version of the ABI believed most conformant with the C++ ABI
+; specification. This ABI may change as bugs are discovered and fixed.
+; Therefore, 0 will not necessarily indicate the same ABI in different
+; versions of G++.
+;
+; 1: The version of the ABI first used in G++ 3.2.
+;
+; Additional positive integers will be assigned as new versions of
+; the ABI become the default version of the ABI.
fabi-version=
Common Joined UInteger Var(flag_abi_version) Init(2)
falign-loops=
Common RejectNegative Joined UInteger
+; This flag is only tested if alias checking is enabled.
+; 0 if pointer arguments may alias each other. True in C.
+; 1 if pointer arguments may not alias each other but may alias
+; global variables.
+; 2 if pointer arguments may not alias each other and may not
+; alias global variables. True in Fortran.
+; The value is ignored if flag_alias_check is 0.
fargument-alias
Common Report Var(flag_argument_noalias,0)
Specify that arguments may alias each other and globals
Common Report Var(flag_asynchronous_unwind_tables)
Generate unwind tables that are exact at each instruction boundary
+; -fcheck-bounds causes gcc to generate array bounds checks.
+; For C, C++ and ObjC: defaults off.
+; For Java: defaults to on.
+; For Fortran: defaults to off.
fbounds-check
Common Report Var(flag_bounds_check)
Generate code to check bounds before indexing arrays
Common Joined RejectNegative
-fcall-used-<register> Mark <register> as being corrupted by function calls
+; Nonzero for -fcaller-saves: allocate values in regs that need to
+; be saved across function calls, if that produces overall better code.
+; Optional now, so people can test it.
fcaller-saves
Common Report Var(flag_caller_saves)
Save registers around function calls
Common Report Var(flag_data_sections)
Place data items into their own section
+; Nonzero for -fdefer-pop: don't pop args after each function call
+; instead save them up to pop many calls' args with one insns.
fdefer-pop
Common Report Var(flag_defer_pop)
Defer popping functions args from stack until later
ffloat-store
Common Report Var(flag_float_store)
-Do not store floats in registers
+Don't allocate floats and doubles in extended-precision registers
+; Nonzero for -fforce-addr: load memory address into a register before
+; reference to memory. This makes better cse but slower compilation.
fforce-addr
Common Report Var(flag_force_addr)
Copy memory address constants into registers before use
+; Nonzero for -fforce-mem: load memory value into a register
+; before arithmetic on it. This makes better cse but slower compilation.
fforce-mem
Common Report Var(flag_force_mem)
Copy memory operands into registers before use
+; Nonzero means don't put addresses of constant functions in registers.
+; Used for compiling the Unix kernel, where strange substitutions are
+; done on the assembly output.
ffunction-cse
Common Report Var(flag_no_function_cse,0)
Allow function addresses to be held in registers
Common Report Var(flag_guess_branch_prob)
Enable guessing of branch probabilities
+; Nonzero means ignore `#ident' directives. 0 means handle them.
+; Generate position-independent code for executables if possible
+; On SVR4 targets, it also controls whether or not to emit a
+; string identifying the compiler.
fident
Common Report Var(flag_no_ident,0)
Process #ident directives
Common Report Var(flag_if_conversion2)
Perform conversion of conditional jumps to conditional execution
+; -finhibit-size-directive inhibits output of .size for ELF.
+; This is used only for compiling crtstuff.c,
+; and it may be extended to other effects
+; needed for crtstuff.c on other systems.
finhibit-size-directive
Common Report Var(flag_inhibit_size_directive)
Do not generate .size directives
+; Nonzero means that functions declared `inline' will be treated
+; as `static'. Prevents generation of zillions of copies of unused
+; static inline functions; instead, `inlines' are written out
+; only when actually used. Used in conjunction with -g. Also
+; does the right thing with #pragma interface.
finline
Common Report Var(flag_no_inline,0) Init(2)
Pay attention to the \"inline\" keyword
Common Report Var(mem_report)
Report on permanent memory allocation
+; This will attempt to merge constant section constants, if 1 only
+; string constants and constants from constant pool, if 2 also constant
+; variables.
fmerge-all-constants
Common Report Var(flag_merge_constants,2) Init(1)
Attempt to merge identical constants and constant variables
Common Report Var(flag_peephole2)
Enable an RTL peephole pass before sched2
+fPIC
+Common Report Var(flag_pic,2)
+Generate position-independent code if possible (large mode)
+
+fPIE
+Common Report Var(flag_pie,2)
+Generate position-independent code for executables if possible (large mode)
+
fpic
Common Report Var(flag_pic,1) VarExists
-Generate position-independent code if possible
+Generate position-independent code if possible (small mode)
fpie
Common Report Var(flag_pie,1) VarExists
-Generate position-independent code for executables if possible
+Generate position-independent code for executables if possible (small mode)
fprefetch-loop-arrays
Common Report Var(flag_prefetch_loop_arrays)
Common Report Var(flag_schedule_insns_after_reload)
Reschedule instructions after register allocation
+; sched_stalled_insns means that insns can be moved prematurely from the queue
+; of stalled insns into the ready list.
fsched-stalled-insns
Common Report Var(flag_sched_stalled_insns)
Allow premature scheduling of queued insns
Common RejectNegative Joined UInteger
-fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
+; sched_stalled_insns_dep controls how many recently scheduled cycles will
+; be examined for a dependency on a stalled insn that is candidate for
+; premature removal from the queue of stalled insns into the ready list (has
+; an effect only if the flag 'sched_stalled_insns' is set).
fsched-stalled-insns-dep
Common Report Var(flag_sched_stalled_insns_dep,1) Init(1)
Set dependence distance checking in premature scheduling of queued insns
Common Report Var(flag_single_precision_constant)
Convert floating point constants to single precision constants
+; Emit code to probe the stack, to help detect stack overflow; also
+; may cause large objects to be allocated dynamically.
fstack-check
Common Report Var(flag_stack_check)
Insert stack checking code into the program
Common Report Var(flag_strength_reduce)
Perform strength reduction optimizations
+; Nonzero if we should do (language-dependent) alias analysis.
+; Typically, this analysis will assume that expressions of certain
+; types do not alias expressions of certain other types. Only used
+; if alias analysis (in general) is enabled.
fstrict-aliasing
Common Report Var(flag_strict_aliasing)
Assume strict aliasing rules apply
Common Report Var(flag_tracer)
Perform superblock formation via tail duplication
+; Zero means that floating-point math operations cannot generate a
+; (user-visible) trap. This is the case, for example, in nonstop
+; IEEE 754 arithmetic.
ftrapping-math
Common Report Var(flag_trapping_math)
Assume floating-point operations can trap
Common Report Var(flag_tree_fre)
Enable Full Redundancy Elimination (FRE) on trees
+ftree-lim
+Common Report Var(flag_tree_lim) Init(1)
+Enable loop invariant motion on trees
+
+ftree-loop-optimize
+Common Report Var(flag_tree_loop_optimize) Init(1)
+Enable loop optimizations on tree level
+
ftree-points-to=
Common Joined RejectNegative
Common Report Var(flag_unroll_all_loops)
Perform loop unrolling for all loops
+; Nonzero means that unsafe floating-point math optimizations are allowed
+; for the sake of speed. IEEE compliance is not guaranteed, and operations
+; are allowed to assume that their arguments and results are "normal"
+; (e.g., nonnegative for SQRT).
funsafe-math-optimizations
Common Report Var(flag_unsafe_math_optimizations)
Allow math optimizations that may violate IEEE or ISO standards
Common Report Var(flag_var_tracking) VarExists
Perform variable tracking
+; -fverbose-asm causes extra commentary information to be produced in
+; the generated assembly code (to make it more readable). This option
+; is generally only of use to those who actually need to read the
+; generated assembly code (perhaps while debugging the compiler itself).
+; -fno-verbose-asm, the default, causes the extra information
+; to not be added and is useful when comparing two assembler files.
fverbose-asm
Common Report Var(flag_verbose_asm)
Add extra commentary to assembler output
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